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(No Model.) t t J. B. EADS.

DEVICE FOR CONVERTING MOTION. No. 305,440. Patented Sept. 23, 18

WITNESSES: VENT #2:

N. PEYERS. mulo-Lldmm w. Wnhington llC.

JOHN B. EADS, OF MATIOON, ILLINOIS, ASS IGNOR OF ONE-HALF TO W. B.

LElTOH, OF SAME PLACE.

DEVICE FOR CONVERTING. MOTION.

SPECIFICATION forming part of Letters Patent No. 305,440, datedSeptember 23, 1884.

Application filed February 8, 1884.

To all whom it may concern: I

Be it known that I, JOHN B. EADS, a citizen of the United States,residing at Mattoon, in the county of Ooles, State of Illinois, haveinvented a new and useful Improvement in De vices for Converting Motion,which improve ment is fully set forth in the following specification andaccompanying drawings, in which- Figure 1 is a longitudinal section ofthe portion of a device for converting motion, embodying my invention.Fig. 2 is a transverse section in line a; m, Fig. 1. Fig. 3 is atransverse section in line y y, Fig. 2. of a detached portion, partthereof being in horizontal section.

Similar letters of reference indicate corresponding parts in the severalfigures.

My invention'consists of a device for converting motion, theconstruction and operation of the same being hereinafter fully setforth.

Referring to the drawings, A represents a steam-cylinder, and B a pistonthereof, both of usual construction.

0 represents a piston-rod, the outer end of which is attached to asliding head, D, which latter is properly mounted and guided and hasconnected with it an oscillating piece, E, the latter being ofelliptical form with pointed ends.

F represents a cylinder, formed with a continuous groove, G, whichextends spirally around the face of the cylinder from one end to theother, returning to the first-named end and joining the same, and intothe groove projects the piece E. The cylinder F is formed with orsecured to the main shaft H, to which latter-the power of the engine isto be communicated.

It will be seen that when steam is admitted to the cylinder A, thepiston receives reciprocating motion as usual. The oscillatingrollerpiece E, carried by the piston-rod in opposite directions, movingin the spiral groove G of the cylinder F, causes the continuous rotationof said cylinder and consequently of the shaft H, thepower of the enginethus being transmitted to the latter.

Fig. 4 is a top view (No model.)

It will be seen that a crank is avoided and there is a vast increase ofpower.

In order to operate the valve, I connect with the valve-stem an elbow orother suitable lever, J, which is properly mounted and receivesreciprocating motions from ayoke, K, and eccentric L, the latter beingconnected with the main shaft, and by its rotations oscillates the yoke,and consequently moves the lever J, whereby the valve is shifted, saidyoke encircling or straddling the piston-rod, whereby the parts are few,simple, and compact. The piece E, owing to its oscillations, changesposition as it runs through the groove G, due to the spiral formthereof, and so oper ates thereon without binding or strain, and whenthe piston is at the end of its stroke, the flywheel of the enginecauses the piece E to pass the center of the cylinder F, so that itreadily re-enters the proper part of the groove for the advance orreturn motion, it being seen that the piece always conforms to thedirection of curvature of the groove, and readily seeks its passage inthe groove G'without liability to jamb at the turn of the groove owingto its pointed end.

It is evident that while I have described the cylinder F on the mainshaft H, the latter, if

to the piston-rod, an eccentric onthe rotary shaft, a yoke on saideccentric, and an elbow lever connected with the yoke and valve-stem,said yoke encircling the piston-rod, substantially as and for thepurpose set forth.

JOHN B. EADS.

\Vitnesses:

W. B. Lnrrcrr, SUMNER Annnnson.

